Piston-ring



F. HACHMANN.

PISTON RING.

APPLICATION FlLEDfEB. 5. 1919. 1,348,641 Patented Aug. 3, 1920.

UNITED STATES PATENT OFFICE.

FREDERICK HAOHMANN, OF ST. LOUIS, MISSOURI, ASSIGNOB 0F ONE-HALF TO HERMAN STIEFEL, 0] 8'1. LOUIS, MISSOURI, ONE-EIGHTH TO DAVID M. BUTCH- INSON, OF FERGUSON, HISSOUBI, AND ONE-SIXTEENTH TO PHILIP E. MOODY, ONE-SIXTEENTH T0 CHAUNCEY-R. WATSON, AND ONE-SIXTEEN TO B. A. WRIGHT, ALL OF DETBDIT, MICHIGAN.

PISTON-RING.

Specification of Letters Patent.

Patented Aug. 3, 1920.

Application ma February 5, 1919. Serial No. 275,137.

To all whom it may concern:

Be it known that I, FREDERICK HAOHMANN, a citizen of the United States, and resident of the city of St. Louis and State of Missouri, have invented certain new and useful Improvements in Piston-Rings, of which the following is a specification containing a full, clear, and exact description, reference being had to the accompanying drawings, forming a art thereof.

y invention relates to improvements in piston rings and has for its primary object a ring in which the ring surface and the inner surface of the c linder are brought close together. A furt er object is to provide a metal piston ring with a strip or strips of metal softer than the cylinder or piston rin so as to provide a quick wearing surface. t has been found in practice that piston rings of the present construction are not true circles and therefore do not work or fit snugly against the cylinder walls allowing a certaln amount of leakage. By my construction this defect is entirely overcome.

In the drawings:

Figure 1 is a side elevation of my improved ring.

Fig. 2 is an edge view. 7 Fig. 3 is a section taken on the line 3-- 3 of Fig. 2.

Fig. 4 is a section. taken on the line 4-4 of Fig. 1. i

Fig. 5 is a section taken on the line 5-5 of Fig. 2.

- Fig. 6 is a fragmental section illustrating oneend of the ring, that is, the lapped portion.

Referring to the drawings, 10 indicates a piston ring which is of the ordinary construction. In this piston ring are located grooves 11 and 12, these grooves being 10- f cated near each edge and extending to the lap or, in other words, practically around the ring. a

The ends 13 and 14 of the grooves 11 and 12 which run into the lapped ortion are provided with a recess 15. n the grooves 11 and 12 are located rings 16 which are made of brass or other.similar material, in fact, anything softer than the piston rings or cylinder casing, but still having resiliency. The ends of these rings are bent inwardly forming tongues 17 which fit in the recess.

These rin as previously stated are made out of meta softer than the ring or cylinder and I preferably employ brass or a composition of cop er and zinc or a composition of zinc, lea and tin so as to afford a quick wearing surface and prevent .leakage until the body is worn down to fit the cylinder walls, in other words, these rings, when. they are first installed, do not form a tight fit, but in view of the fact that they wear quickly, they soon weardown to tightly fit the cylinder and maintain a fluid tight joint until the ring itself has worn down to fit the cylinder wall.

Havin fully described my invention, what I c aim is:

A one piece piston ring provided with a lapped portion and with parallel grooves extendin throu bout the periphery of the ring an into t e lapped portions, a cutaway portion forme at each end of the lapped portion and extendin from the parallel grooves to the interior ace of the ring,-

a metallic ring of softer material than the piston ring. seated in each groove, and inwardly bent ends formed on each end of the metallic ring for holding the metallic rin against rotation said inwardly bent en s bein seated in the grooves formed in the lappe portion.

In testimony whereof I have signed my name to this'specification, in presence of 

